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| the force that pulls bodies or objects toward other bodies |
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| earth's path as it travels around the Sun |
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| a large body made of rock or gas that moves around a star |
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| made up of the sun, eight planets, and other small bodies that orbit the sun |
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| Earth turns on an imaginary line called this |
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| occurs when the Moon passes into Earth's shadow |
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| changes in the amount of the sunlit half of the Moon that can be seen from Earth |
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| a trip around the sun that takes a year |
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| with each one of these on the Earth's axis, there is one period of daylight and one period of night |
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| a group of stars that forms a pattern in the night sky |
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| a huge system, or group, of stars held together by gravity |
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| a huge ball of very hot gas that gives off light, heat, and other kinds of energy |
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| a system made up of all the matter and energy there is, including galaxies, and their stars, planets, and moons |
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